Substratum

“ By a remarkable transformation, the larger granular cells of the interior burst out and grow over the outer flagellate layer of cells, and the latter become the collar-cells of the adult sponge. A minute sponge with one oscule results from the development of the fertilised ovum. An extensive crust with numerous oscules may be regarded either as a colony in which each oscule represents an individual, or simply as one individual in which the growth of the body necessitates the formation of new channels for the conveyance of food materials. ”

“ Like our previous example, it is a one-celled plant and herein lies its interest. When find a specimen growing by a pond, we shall notice a green bladderlike portion, not more than 1/6 inch in diameter, which projects above the ground. Below ground, if we pick the soil away carefully we may observe a number of colourless, branched structures which do duty for roots. The bladder and underground portions are hollow, being lined in the case of the former, with a network of chlorophyll beautiful to observe under the microscope. ”

“ Further development of this field of research, by the use of the greatest variety of substrates from all kinds of substances, is required, in order to give an answer to the question of the peculiarities of certain kinds of cells in many directions. It will be possible in future to recognize certain cells by the manner in which they reduce substrates, the synthesis of which, as a matter of course, must be previously fully known to us. ”

“ The manner in which a substrate is prepared is of the greatest importance for the whole success of the dialysation process, and, unless one adheres to the directions in every particular, one is bound to meet with unsuccessful results. These, however, can be successfully avoided if the preparation of the substrate be carried out with proper attention. The principle of the matter is, to obtain substrates which contain coagulated albumen and are absolutely free from diffusible substances which react with ninhydrin. ”

“ The water, or liquid, when it mounts a stem or tree trunk, takes a path that leads through the new-made cells. Each young cell wall is made of such delicate material that it allows the water, or broth, to filter through it, just as it would pass through a piece of thin cloth. And so it makes its way from cell to cell, along the stem, more slowly than if it were passing through a hollow tube, but almost as surely. It is true, the earth broth does not reach the leaves above without having given up something to the little cells along the road. ”

“ An ample pipe-system extends from root, through stem, to leaf, but it does not communicate directly with the openings at either end. All material, whether liquid or gaseous, absorbed or given out, has to run the gauntlet of the living cells, which are jealous watchmen, and allow only selected substances to pass through them. The crude building materials and food materials are assembled in the leaves, where in cells spread out to the light the chlorophyll is massed. Under the microscope, the chlorophyll is seen to be located in minute granules embedded in the semifluid contents of the cells. ”

“ If the protoplasm contains visible granules, as it usually does, within a clear external layer, we see that these stream constantly forwards along the central axis of each process as it forms, and backwards just within the clear layer all round, like a fountain playing in a bell-jar. ”

“ The living matter, flowing now this way now that, lays down the walls of its tubes as it flows, and by and by, here and there, a tube, instead of working into the paste, grows upwards into the air and swells at the tip into a colourless ball in which a number of minute seed-like bodies called spores are formed. ”

“ Among the elongated cells of this outer layer, some unite to form the pitted ducts. Being, as we see, better circumstanced mechanically, they become greater carriers of sap than the original vessels, and, in consequence of this, as well as in consequence of their relative proximity, become the sources of nutrition to the still more external layers of wood-cells. ”

“ They may use up all the protoplasm of the rod in their formation, or they may use only a small part of it, the rod which forms them continuing its activities in spite of the formation of the spores within it. They are always clear and highly refractive from containing little water, and they do not so readily absorb staining material as the ordinary rods. ”

“ But besides this means of increase I assume that cells, before their conversion into completely passive or "formed material," throw off minute granules or atoms, which circulate freely throughout the system, and when supplied with proper nutriment multiply by self-division, subsequently becoming developed into cells like those from which they were derived. These granules for the sake of distinctness may be called cell-gemmules, or, as the cellular theory is not fully established, simply gemmules. ”

“ All the books and instructions insist that the selection of the soil is the most important part of gardening. No doubt it is. But, if a man has already selected his own backyard before he opens the book, what remedy is there? All the books lay stress on the need of “a deep, friable loam full of nitrogen.” This I have never seen. My own plot of land I found on examination to contain nothing but earth. I could see no trace of nitrogen. I do not deny the existence of loam. There may be such a thing. But I am admitting now in all humility of mind that I don’t know what loam is. ”

“ But the blindness of those who think it absurd to suppose that complex organic forms may have arisen by successive modifications out of simple ones, becomes astonishing when we remember that complex organic forms are daily being thus produced. A tree differs from a seed immeasurably in every respect—in bulk, in structure, in colour, in form, in chemical composition: differs so greatly that no visible resemblance of any kind can be pointed out between them. Yet is the one changed in the course of a few years into the other: ”

“ "It is often said that all the conditions for the first production of a living organism are now present, which could ever have been present. But if (and oh! what a big if!) we could conceive in some warm little pond, with all sorts of ammonia and phosphoric salts, light, heat, electricity, etc., present, that a proteine compound was chemically formed ready to undergo still more complex changes, at the present day such matter would be instantly devoured or absorbed, which would not have been the case before living creatures were formed.") ”

“ I do not mean that, Mac,—not the mere mechanical warp and woof of it, to hang beggars and sots with,—but the more potent essence, the inner cosmic power of it, to rouse the soul into grand expansive consciousness, and then to suspend it far above the carks and cares of this weary world, to sew it aloft to some leaf of the Tree of Life, like the nest of Jean Paul's tailor-bird, that it may swing there, above the hum and dust of matter, swayed and sung to sleep by the expanding breath of Infinity! ”

“ The planted seed consigned to common earth,
Disdains to moulder with the baser clay;
But rises up to meet the light of day,
Spreads all its leaves, and flowers, and tendrils forth;
And, bathed and ripened in the genial ray,
Pours out its perfume on the wandering gales,
Till in that fragrant breath its life exhales. ”

“ Impelled by a resistless force I still rose, although now against a crushing pressure and an active resistance which seemed to beat me back, and I fought my upward way in an agony which resembled nothing so much as the terrible moment when, from strangling or suffocation, all the forces of life struggle against death, and wrestle madly for another breath. ”

“ When we compare the individuals of the same variety or sub-variety of our older cultivated plants and animals, one of the first points which strikes us is, that they generally differ more from each other than do the individuals of any one species or variety in a state of nature. And if we reflect on the vast diversity of the plants and animals which have been cultivated, and which have varied during all ages under the most different climates and treatment, we are driven to conclude that this great variability is due to our domestic productions having been raised under conditions of life not so uniform as, and somewhat different from, those to which the parent species had been exposed under nature. ”

“ But just in proportion as this process of extermination has acted on an enormous scale, so must the number of intermediate varieties, which have formerly existed on the earth, be truly enormous. Why then is not every geological formation and every stratum full of such intermediate links? Geology assuredly does not reveal any such finely graduated organic chain; and this, perhaps, is the most obvious and gravest objection which can be urged against my theory. The explanation lies, as I believe, in the extreme imperfection of the geological record. ”

“ Diagram of the same cell of a tentacle, showing the various forms successively assumed by the aggregated masses of protoplasm. ”

“ Darwin has interested us in the history of Nature’s Technology, i.e., in the formation of the organs of plants and animals, which organs serve as instruments of production for sustaining life. ”

“ After I had learned a great many interesting things about the life and habits of the children of the sea—how in the midst of dashing waves the little polyps build the beautiful coral isles of the Pacific, and the foraminifera have made the chalk-hills of many a land—my teacher read me "The Chambered Nautilus," and showed me that the shell-building process of the mollusks is symbolical of the development of the mind. ”

“ The affinities of all the beings of the same class have sometimes been represented by a great tree. I believe this simile largely speaks the truth. The green and budding twigs may represent existing species; and those produced during former years may represent the long succession of extinct species. At each period of growth all the growing twigs have tried to branch out on all sides, and to overtop and kill the surrounding twigs and branches, in the same manner as species and groups of species have at all times overmastered other species in the great battle for life. ”

“ In treating of this question, I shall begin with the doctrine of progression, a concise statement of which, so far as it relates to the animal kingdom, was thus given twelve years ago by Professor Sedgwick, in the preface to his Discourse on the Studies of the University of Cambridge.
'There are traces,' he says, 'among the old deposits of the earth of an organic progression among the successive forms of life. They are to be seen in the absence of mammalia in the older, and their very rare appearance in the newer secondary groups; in the diffusion of warm-blooded quadrupeds ”

“ Hence, water ought by no means to be conducted in lead pipes, if we want to have it wholesome. That the taste is better when it comes from clay pipes may be proved by everyday life, for though our tables are loaded with silver vessels, yet everybody uses earthenware for the sake of purity of taste. ”

“ How admirable is the Western method of submitting all theory to scrupulous experimental verification! That empirical procedure has gone hand in hand with the gift for introspection which is my Eastern heritage. Together they have enabled me to sunder the silences of natural realms long uncommunicative. The telltale charts of my crescograph 8-2 are evidence for the most skeptical that plants have a sensitive nervous system and a varied emotional life. ”

“ To sunshine we fly from too piercing an air;
But love's ardent fire burns always the same,
No winter can cool it, no summer inflame.
But see the pale moon, all clouded, retires;
The breezes grow cool, not Strephon's desires:
I fly from the dangers of tempest and wind,
Yet nourish the madness that preys on my mind.
Ah, wretch! how can life be worthy thy care? ”

“ Here and there a giant peak rising from these sunless depths lifts his head to see the sky, and the dredge and trawl tell us that all along his rugged sides, and on the hills and plains below, and even in the inky blackness and the freezing cold of the deepest valleys, there is life. ”

“ IF we would hear the children of the sun, we must shut the door of our prosaic room behind us, and hurry out before the coming on of dusk to the pond, into the green field, on the moor, to the edge of the wood where life in the double form of animal and plant unfolds itself without restraint. From up in the air, from plants, flowers, grass, holes in the ground, and the moisture of puddles, come a chirping and rattling, a humming and buzzing, a piping and singing of the host of winged and wingless creeping and hopping insects. ”

“ The boat went cutting through the tide-waves and dashing the spray over her bows, the wide sea was opening all around them,—the salt wind stung his brain to keener life. To what horrid fate were they hurrying, she alone with this maniacal man? Out there beyond, away and away, the mighty billows tossed in their cruel glee, silvered their crests and horns in the moonlight, and grew and disappeared like phantoms. ”

“ In their drawing-room home they roll themselves up and sleep as dormice do in cold weather, but with warmth and sunlight they expand their petal-like tentacles, and as flies in summer air, now float on the surface of the water, now gem the fronds of the sea-blooms, hang like blossoms from a spray, or deck the brown rock with life and beauty. ”

“ For the old pupils of Eden, the thought of its church is perhaps closest to memory and dearest to heart, among the many close and dear relics that accompany them through life. Its picture has value, and even a word concerning it is not worthless, for its aisles, its altar, its nooks, keep sacred hours of the past safe in those quiet shadows which breathe out incense. ”